wrote in message
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Why hasn't this approach been used more frequently in 35mm as well? [...]

Funny this should come up. One of my student workers just now returned my
Contaflex, which as you know is an SLR that with a Prontor leaf shutuer and
X,M synchro, and of course it has interchangable lenses. It remains one of
my favorite miniature cameras with the 30mm lens.

Why wasn't it used more? For one, it's expensive and entails rather strident
limitations. To make this Contax system work there is one common lens behind
the shutter and all the lenses use it as the rear element. I can post some
pictures of the lens system if you like.